Chair.



PATENTED JULY 3, 1906.

@ J. GILSON.

CHAIR.

APPLICATION I-ILED FEB. e. 1905.

2 SHEETS-SHEET 1.

PATEN TED JULY 3,

J. GILSON.

, CHAIR.

APPLICATION FILED FEB. a 1905.

No. 824mm.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFIOE.

Specification of Letters Patent.

Patented July 3, 1906.

Application filed February 6. 1905. Serial No. 244,282.

To all whom it may concern.-

Be it known that I, J OHN GILsoN, a citizen of the United States, and a resident of Port WVashington, in the county of Ozaukee and State of WVisconsin, have invented certain new and useful Improvements in Chairs and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention consists in certain peculiarities of construction and combination of parts, hereinafter described with reference to the accompanying drawings and subsequently claimed, its object being to provide simple, economical, light, strong, and durable seat-spiders for tilting chairs.

Figure 1 of the drawings represents avertical longitudinal section view of a chair-seat spider in accordance with my invention; Fig. 2, a plan view of the spider inverted and partly in horizontal section; Fig. 3, a transverse sectional view of said spider, this view being indicated by lines 3 3 in Fig. 1; Fig. 4, a similar view on the plane indicated byline 4 4 inF ig. 2, and Fig. 5 a perspective view of one of a pair of pivot-brackets in the spider.

Referring by letter to the drawings, A indicates a standard having a hub b, in which the upper end of a seat-spider pivot (not shown) is made fast, and to this standard the depending ears 0 of my improved seat-spider are pivotally connected by a rod B, as is common in the art. The usual upwardlyprojecting stop-lugs cl are provided on the standard.

Each spider-ear c is a depending portion of an angular bracket O, that constitutes an arch, and results from suitable bending of what is preferably a sheet-steel blank. Riveted or otherwise suitably connected to upper horizontal portions of the opposite brackets is a bridge-plate D and right-angle spider-arms E, these arms being referably made from sheet-steel bent into t e angular form shown and arranged to overlap the bridge-plate. The vertical upper portions of the brackets are bent to provide outer lateral flangese forward of the pivot-ear c, and the vertical portion of an arm E rests on said flanges. Each arch-bracket of the pair has the inner wall thereof horizontally extended and pro vided with an inner recess, the extensions of said wall being ears f, and the stop-lugs d of the standard A engage the recesses of the brackets. Forward tilt of a chair-seat is limited by contact of the rear ears of the brackets with the stop-lugs of the standard,

and rearward tilt of said seat is limited by contact of the front ears of said brackets with said lugs. The central portion of the seat-spider is of minimum width, and said bars are bent at the front and rear to in crease thedistance between the same and to provide for greater rigidity ofconnection with a chair-seat frame. It is within the scope of my invention to makethe earsfcontinuous between the brackets and omit the bridge-plate. The channel-arms E of the spider may beotherwise than right angular in cross-section.

The bridge-plate D is set in on lower lugs g of a rear brace-bar F between the spiderarms, and an upper lug h of the brace-bar overlaps said plate central of the same. Other lugs g of the brace-bar rest on the ears f of the pivot-brackets. The brace-bar is provided with rear bosses i, that engage ends of spiral springs G, that are also sup- )orted at their other ends on bosses j of a tension bar H on a rod I, that extends through a forward central recess of the standard. The sustaining-sleeve J on the rod I is provided with the usual lateral lugs 7c in rocking engagement with notches in parallel ribs .m of the standard, and the nut K, running on the screw-threaded end of said rod against said sleeve, serves to regulate the tension of the springs aforesaid.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A chairseat spider comprising a pair of opposite brackets each constituting an arch having the inner wall thereof vertically re cessed and horizontally extended adjacent to the recess to form ears, a standard provided with lugs engaging the inner-wall recesses of the brackets, a bridge-plate fastened at its ends on said brackets, and arms in rigid connection with the plate and brackets.

2. A chair-seat spider comprising a pair of opposite brackets each constituting an arch provided with outer lateral flanges and inner horizontal ears, a standard provided with stop-lugs each engaging space between the aforesaid ears of a bracket, a bridgeplate on the brackets, arms supported on the bridge-plate and outer flanges of the brackets, and means rigidly connecting the arms, bridge-plate and brackets.

3. A chair-seat spider comprising a pair of opposite arch-brackets each having a depending pivot-ear and horizontal inner ears, a

standard to which the pivot-ears of the bracket are connected and which is provided with stop-lugs each. of which engages space between. said horizontal inner ears of a bracket, a bridge-plate on the brackets, arms on the bridge-plate, and means rigidly connecting the arms, bridge plate and brackets.

4. A chair-scat spider comprising a pair of connected pivot-brackets each constituting an arch having the inner wall thereof vertically recessed to provide a play-space for the engagement of a stop-lug of a standard to which the spider is pivotally connected.

5. A chair-seat spider comprising a pair of connected brackets each constituting an arch having the inner wall thereof provided with play-Sp ace for the engagement of a stoplug of a standard to which the spider is pivotally connected, arms in rigid connection with the brackets, and a spring-supporting brace-bar between the arms.

6. A chair-seat spider comprising a pair of l connected brackets each constituting an arch having the inner wall thereof provided with. horizontal extensions and recessed to provide limited play-space for a stop-lug of a standard to which the spider is pivotally connected, a bridge-plate on the brackets, arms in rigid connection with said brackets and interposed bridge-plate, and a spring-supporting brace-bar between the arms provided with lugs that lap opposite sides of the bridge-plate and rest on inner-wall extensions of the aforesaid brackets. In testimony that 1 claim the foregoing I l, have hereunto set my hand, at Port VVashington, in the county of Ozaukee and State of 1 Wisconsin, in the presence of two witnesses.

JOHN GILSON.

i Witnesses:

\ AUG. BOERGER, i T. A. BOERNER. 

